Molding bath-tubs and other large articles.



h BKEET$-SREET 1.

ZEATENTED JUNE 30, 190 3.

P. DUPONT. TH TUBS AND OTHER LARGE ARTICLES.

APPLICATION FILED mm: as, 1005.

0 Duo Q 0% O O O O 'MQLDING BA WITNESSES f6 6, azwzya/ PATENTED JUNE 80, 1908.

P. DUPONT. MOLDING BATH TUBS AND OTHER LARGE ARTICLES.

APPLICATION FILE .TYTNB 28, 1906.

1 SHEETS-11331 2.

WITNESSES PATENTED JUNE 30, 1908 P. DUPONT. IEZOLDING BATH TUBS AND OTHER LARGE ARTICLES.

APPLICATION FILED JUNE 28 1906" 4 SHEETS-SHEET 3.

1N VE NTOH Pau Z 2700721 WITNESSES.

ATTOHNE Y8 No. 892,144. I lATENTED JUNE 30, 1908. P. DUPONT.

MOLDING BATH TUBS AND OTHER LARGE ARTICLES.

APPLICATION TILED JUHE 2B, 1906.

r 4 SHEETS-SHEET 4.

Q5 .15. VE q WITNESSES HWENTOH .PCLLLZ .DZL/IIOYLZL ATTORNEYS sition.

PAUL DUPONT, OF LE OATEAU, FRANCE.

MOLDING BATH-TUBS AND OTHER LARGE ARTICLES.

Specification of Letters Patent.

Patented June 30, 1908.

Continuation of application Serial No. 187,267, filed December 31, 1903. This application filed June 28, 1906. i

' Serial No. 323,901.

To all whom it may concern:

Be it known that 1, PAUL DUPONT, a citizen of the Republic of France, residing at Le Cateau, '(Nord,) in the Republic of France,

.have made a certain new and useful Invention Appertaining to Molding Bath-Tubs and other Large Articles, of'which the following is a specification.

Heretofore, so far as I am aware, no method or a paratus has been devised for the successfu or practical mechanical molding of large hollow articles, such as bath tubs, but my invention enables this result to be accomplished.

In moldin such'an article as a bath tub, where the wa ls are very thin, great skill and care are essential in the making of the mold. The s ace to be occupied by the cast metal is so t. in in cross-section, and so extensive in area, that the respective parts of the mold in .the cope and drag must be made with the greatest accuracy. Furthermore, the molded surfaces must be uniformly dense and firm, in order that no parts thereof will yield or sag du ing the pouring operation, and thereby produce an article having walls of uniform thickness. In order to mold these surfaces accurately, and with the required density, I provide means for the uniform distribution of the sand over the face of the pattern, preliminarily toicompressing said sand against the pattern, and make provision, a so, for the roper alinement of the compressor and ask, and for assuring an accurate vertical travel of the flask towards the compressor, or vice versa, preferably a movement of said flask toward the compressor while the latter For the purpose of retaining the body of the sand in a fixed position after molding, and during the pouring, I not only employ great ressurein molding both the drag and cope, ut-I allow the compressors to remain in the flask until after the metal has been poured into the mold.

During the operation of molding the cope, I support the pattern by a reinforcing frame in or er to prevent said pattern from yieldg or breaking under the great pressure to which it is sub ected- My invention dispenses with the necessity v of employing1 skilled labor, and this advan tage, coup occupies a fixed pc- .with the fact that the ppera-v tions of molding can be quickly and easily performed, enable me to make articles of the character under consideration very econom- The invention will now be described more in detail, and other advantages thereof pointed out, in oonp nction with the accompanying drawings wherein,

- Figure 1 is a vertical longitudinal section of a two-part flask having a pattern between the two parts thereof; Fig. 2 is a cross-section. on line 2-2 of Fig. 1; Figs. 3, 1 and 5 are a longitudinal section,-a transverse section, and a plan, respectively, of a rammer,

or compressor, for compressing sand against the outer side of a pattern, the said rannner having movable gate formers fitted thereto; Figs. 6, 7 and 8 are a lon itudinal section, a transverse section on the line 7-7 of Fig. 8, and a plan, respectively, of another ranimer designed to ram odcompress the sand against the inner side of a pattcrn;-Figs. 9 and 10 are a .longitudinal section, and a transverse section, respectively, of a reinforcing or stilfening frame, for the pur ose of enabling the pattern to resist the hig pressure incident to the com ression of the sand against the outer side of t 1e pattern; Fig. 11 is a general view showing the parts assembled and mounted within a press, for compressing the sand against the outer side of the pattern, prior to the operation of com ressing; Fig. 12 is a similar view to that 0 Fig. 11, showing the relation of the parts after the com 'ression of the sand against theouter side oft 1e pattern; Fig. 13' shows the flask and pattern in an inverted position from that shown in Figs. 11 and 12, the parts being in the ositions which they occupy after the sand ias been comressed against the inner side of the pattern; ig. 14 is a vertical section, partly in elevation, showing" the assembled drag and pattern, lowered away or separated from the cope, said cope being suspended from the press head; Fig. 15 is a view similar to that shown in Fi 14, but with the pattern and cope assemb ed; Fig. 16 is a vertical section, partly in elevation, showing the pattern as separated or-withdrawn from the cope;

Fig. 17 is'a vertical section showingthe position of the several parts of the apparatus after the pouring operation and 18 is a plan view of the central gate name shown in Fig; 1.7.

in my invention I employ two-part ilaslr, consisting of the cope A and drag i5.

is a pattern, as illustrated a pattern bath tub, a being the bottom, the inclined sides, I; the curvedtop edge, and (Z the flanges G, the inner face of which corresponds in pro-- file to the outer face of the pattern, the side walls, 9 g, of said compressor beinginclined at an'angle to the vertical side walls of the cope. this shape or form of compressor enables the same to enter the cope and. preliminarily distribute the sand uniformly over the face of the pattern prior to compressing it thereon; a further travel or mo current of whereby said said compressor into the cope serving to mold or compress the sand evenly and uniformly upon the outer'side of the pattern.

The top or upper surface, g oi the com pressor is provided. with openings, preferably three in number, through which extend gate formers, 71', i, j, the'latter being provided with, .iianges f, adapted to rest on the top g, gate formers are removably supported in position on the compressor. if desirable, the openings for the gate formers may be made of such size as to crruit an adjustme'ntoi the gate formers r and 7', sidewise oi the compressor, and of the former i, lengthwise thereof, shown in Figs. 3 and 5. The gate formers It, i and c, are hollow. and made, preferably, from steel, the gate formers h and 7, being tapering or wedge-she, ed at their lower ends, so to facilitate t 1e forming ofthe gates. After the molding operation, but prior to pouring, the gate formers 7i and are replaced by gate frames g, which are held in positionby pins 1', the function of which scription of the opcrajtitm oi the a 'iparatus.

The to rol the coin rcssor is slrcrwti-iened I I b or reintorccd by ribs g onv the exterior surface thereof, and said ribs are preferably made of such height as to bring the tops thereof in the same plane as the tops oi" the gate formers, thereby permitting the said ribs and gate formers to engage the head of the press when the compressor is holdv in place against the gate frames will be more fully out in connection with the dcouter side oi. said pattern, I employ a supporting or reinforcing frame D, which is placed in position to engage with the inner side of the pattern. The profile of the outer surface of this hams corresponds, preferwith that of the inner sideof the pattern, the said ironic being composed, preferably, oi a base board d", the longitudinal rib r72 transverse spaced ribs d, extending upwardly from said base board, and the transverse spaced ribs (1, extending downwardly therefrom. l

in compressing sand against the inner side o1 the pattern, I employ asecoiid com pressor H, see Figs. 6, 7 and 8, the exterior surface of which has a profile corresponding to that of the inner side of the pattern. said compressor is provided with a marginal flange m, and from the under or inner side of said compressor, which is made hollow, and likewise from the flange m, extend strengthening ribs m. The outeri'ace of the compressor is' provided with ribs or strips 0, made from angle iron or steel, the edges of which are beveled or sharpened as shown by p. l v hen the pattern is withdrawn fromthe drag, subsequent to the operation of compressing the sand against the inner side of said pattern, these flanges, 0, remain in the sand and assist in retaining it on the com The height of said compressor half the height of the frame I), in order that said compressor may iit accurately within the space in the drag i5, occupied, previously, by said frame.

The cope A is provided with trunnions 7c which enable said cope to be drawn upward against the head F of the press, by means of a movable beam is, to which are attached chainsk", extending from the beam to said trunnions. r r

In order to provide means lor attaching feet or other supports to the bath tub, lugs or projections at, are rcuiovslbly secured to the outer face or side oi the pattern, for the purposeof forming suitably shaped pockets or cavities in thc sand during the operation of molding the outer side ofthe pattcrn.- After this operation the said lugsor projections are detached from the pattern and withdrawn fromthe sand, and replaced by cores of corresponding shape. The lugs, and corre sponding cores are so shaped that after the cores are placed in p'osi 'on and the pouring opei .tion is-coinpleted; the pockets or cavities "formed by said cores 011 616 outer surface oi the tub permit the ready attachment of the feet or other supports.

The compressors G and H are preferably made of metal, such as sheet'iron, and in order to permit the ready escape of air or gases evolved during the casting or pouring opera tion the sides of said compressors are penis 5 of a bath tub.

I ln the operation of molding a bath tub,

rated, as indicated by s, see-Fig. 3, the necessary vents being produced in the sand by molders needles, as is customary inthe art.

, preferred form of press is illustrated in Figs,

11, 14, 15, and 16, wherein the platen or movable member of the press is designated as F. The structure of tie press is set out more in detail, in connect-ion with the de scription of the operation of my new molding ap aratus. p

or convenience in manipulating the several parts of my moldin a paratus, I employ a carria e ortrue; mounted on wheels, and vghich will also be further referred to hereafter.

The construction of the apparatus having now been set forth, its operation will be readily understood from the following deseription thereof with reference to the moldthe pattern is first afiixedin osition be tween the two par-ts of the fias c, the main body of the pattern extendingu wardly into the cope, as clearly appears in igs. 1 and 2; the su porting or reinforcing frame D is then placed on the carriage or truck P, and the pattern and assembled-flask placed over it,

whereupon the truck is wheeled onto the platen of the press, (see Fig. 11); the compressor G. upon which the gate formers, h,

a have been laced inposition, is then socured in a fine position again-st the head F of the press, (see Fig. 11); this having been done the platen of the press is raised in order that the truck may be so positioned on the platen as to bring the pattern in exact alinement, or ropes relative osition, with reference to t ecompressor the platen carrying with it the assembled arts A, B, C, is then lowered, whereupon tie cope is filled with sand, and then leveled off, as shown in Fig ll; the platen is again raised in order that .thecope and the compressor may be brought into cooperative relation; when the compressor enters the cope, its first function to distribute the sand uniformly over the outer faceof the pattern, without producing any material pressure of the sand in a ver- 5.5.

tical direction or aiust the attern, this result beingaccom ished by tie particular shape or contour 0 with re the inner, side walls of the com ressor, these walls being so inclined",

re'noeto the vertical sides of thecope, as to produce a com ress'or, the interior of which is, practically, ofa frustoll conical shape; the inclined walls ofthecompressor act asa wedge in eiiter' the sand, and thereby dis lacethe sand late-rail from the side walls o the cops, 'and:distri ute it uniformly over the outer face of the pattern preliminarily to producing any substantial the further movement of the flask wit refer-- ence to the compressor resulting ina uni form compression of the sand over the en,- tire outer face of the pattern. (Fig. 12). While the compressor G enters the cope along a vertical path, yet by reason of its shape it acts in a manner similar to a wedge, whenused-for splitting wood, in that it produces a lateral or oblique pressure of the sand a ainst the pattern. The first or long part 0% the stroke of the compressor operates, therefore, to produce only an even or uniform distribution of the sand, and in the latter, part, or small part, of the stroke to compress said sand with equal force or ressure throughout the entire outer face 0 the pattern.

In view. of the facts that a' bath tub is a vary large article, and that the walls'thereof must be made relatively thin, it is very es sential, in order to mold these walls of uniform thickness, that the great pressure necessary to accomplish this result be uniformly distributed over the face of the pattern. In order to accom sary to first dlstribute the sand so that it is of practically a uniform depthover all-parts of the pattern; otherwise, greater pressure will be applied to certain parts ofthe pattern than to others, thereb leaving the walls. of the mold less firm y than other parts thereof, resulting in an article the walls of which are of ununiform thickness owing to the tendency of the walls of the mold to yield to the pressure of the metal at the places. where said walls are not firmly compressed.

Another feature of my apparatus cooperatin inthe: roduction of a perfect mold is the fhct that t e outer walls of the compressor are so proportioned as to fit the interior walls of the cops snugly, whereby said com-- The outer faceiof the pattern having been plish this function, it is neces-- compressed the compressor molded as described, the assembled flask and I compressor, the compressor having been dctached from the head of the press, are now inverted, and for convenience and ex edition in carrying out this operation, the ask and compressor may, if desired, be'secured together in the relative positions which-they occupy after the compressing operation. In

practically carrying out thisstep of inverting;

.the flask and compressor, the flask may ha" I re 1 suspended from the beam lc, through the mentarily lowered; the truck is then restored'tov position and the chains detached from the tiunnions, whereupon the platen of the press, carrying the truck and inverted flask is lowered away from the press head. The reinforcing frame D is then withdrawn from its supporting position relative to the pattern. The truck, carrying the. thus assembled parts, is now wheeled oii the" press. At this stage, or any suitable one, in the operation of the apparatus, the gate formers h, i, 7', are removed from the compressor G, and pouring openings formed in the positions occupied by it and j, by means of thepouring gates g, as is usual in the art, and as illustrated in Fig. 17, the central opening i, serving as the main vent during the casting operation.

rhe foregoing operations complete the molding of the outer face of the pattern, the molding surface thus formed serving as the matrix for the bath tub. ln molding the innor face of the pattern, the compressor H is wheeled on a truck upon the platen E, which latter is then raised to bring said compressor H against the head F of the press,

whereupon said compressor is fixedly secured in position'on said head; the platen is then lowered, and after wheeling the empty truck thereoil, the truck P, carrying the inverted flash and pattern, is again run onto the platen,'whereupon the latter is raised in order to bring it into proper alinement with the compressor H, inthe same manner as previously described in connection with the compressor G; the platen with the flask and patsand which is leveled off even with the upper edge of said drag; the platen. and flask are again raised to bring said flask and comressor H into cooperative relation, (see Fig. 13) the flask approaching thecompressor to the extent necessary to produce the required compression of the sand, after distributing the same, on-thc inner face of the pattern.

It will be observed that during this second compressing operation, the compressor G, and the body of sand which has been molded against the outer surface of the pattern, re main in position in the flask, (Fig. 13), thereby serving as backing or support for the pattern durin' the operation of molding the inner face of t is pattern or the surface forming the "inner walls of the bath tub. For this reason, itis unnecessary to employ such a supporting frame in forming that art of the mold corresponding to inner race of the pattern as was employed in forming that part of the mold corresponding to the outer face of said pattern. The and the compressor H, the compressor ing been de tachcd from the head of 'th css, are now tern are now lowered, and the drag filled with seams inverted in the same manner as previously described in connection with the compressor .G, after which inversion the parts of the flask occupy their normal positions, being above the drag B, the flask being susended from the chains in a manner similar to that hereinbefore described in molding the cope; the platen is now. raised to bring it just beneath the flask, whereupon the devices which serve to lock the cope and drag are removed; the flange of the pattern, or that part of the pattern which extendsbetween the cope and drag-and exterior Walls thereof, is now rapped for the purpose of loosening or freeing the outer side of the pattern from the sand in the cope, whereupon the platen, carrying the drag and pattern, is

the cope A lowered; (see Fig. 14); the pattern is again rapped, to tree it from the sand in the drag, hereupon the platen, carrying the drag and the pattern, is again raised to permit the flange of the pattern to. be secured to the cope; the platen, supporting the truck and dra is now lowered (see Fig. 15), and the truck and dragwheeled away; an empty truck is now run onto the platen, whereupon the latter is elevated, the pattern detached from the cope and-deposited on the truck (see Fig. 16), which truck and pattern are then removed from the press, leaving the cope suspended in the press; the truck carrying the drag is now run onto the platen of the press and the platen elevated so that the cope and the drag may helocked together without the intervention of the pattern.

The parts having been assembled as described, and removed to the casting floor, with the matrix or outer face of the pattern molded in the oops, and the patrix or inner face of the pattern molded in the drag, the cope and drag being secured together, the, former having therein the compressor G, and the latter the compressor H, and the gate frames g properly positioned in the com- I pressorG, as previously described, the mold s nowiinfreadiness for pouring. The curing operation having eral parts of the apparatus, with the cast bath tub, occu y the relative position shown in Fig. 17. %he parts of the mold may then be separated, the casting removed, and treated in the manner as is usual with such articles.

It will be understood that a proper reg stration or valinernent of each part of the lie. With its corresponding coin )r'es s'or or ramnnr may be secured in any we known manner, such as by applying marks upon any two corres ending parts, such as the compressor Gr, the cope A, or the compressor H and the drag B, when either mix of said parts have once been correctly alined with relationv to each other.

In practice I have found it desirable to. compress the sand, in each part of the flask, to about one hall its normal or original volbeen completed, te sev- I ume. For this pur ose, the required dimensions of the dome-s raped part, or the frusto conical part, of the com ressor H, which is to form the interior portion of the bath tub, may be obtained by multiplying the dimensioryf the sides of the bath tub by 0.795 or 3s 0.5. By multipl ing the three dimensions representing t is volume of any bath tub by 0.795 a volume reduced by half is obtained. I As previously pointed out, skilled labor i not required in practicing my invention, and this is due to the facts, mainly, that the sand is first uniformly distributed over the pattern in the flask, and then compressed to such a degree thereon, both of said operations being performed automatically and with pre cision, that the surfaces of the resulting mold 'thermore,

are perfect and ermanent, thereby dis ensmg with one of t e most diflicult and de icate l operations in hand molding; namely, the shcking or truing up of the surfaces .of

the mold after removal ofthe pattern. Fun liy my apparatus and method of procedure, employ onl about one half the quantity of sand ordinar' y employed in molding large articles of the character herein described.

It will be understood that slight changes maybe made in the apparatus and procedure as described, without departing from the spirit or substance of my invention, the fore- U going description of my invention embodymg, merely, what I now consider as the best method of racticing' the same.

This-app ication isa continuation of, and substitute application for, a prior application filed by me on December 31, 1903, Serial No. 187,267, and I herewith desire to have it understood that I do not relinouish any of my rights as determined by said prior application.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent is 1. In an apparatus of the class described, a flask, a pattern, a hollow compressor cooperating with the attern and the flask, the interior of said ho ow compressor tapering from its base u ward and forming a pressure surface which 1s substantially frusto-conioal in shape, and the base of which frustocon ical surface is adapted to iirst enter the flask for thepurpose of uniformly distributing sand over the face of the pattern prior to compressing the sand against said pattern 2. In an apparatus of the class described, a flask, a pattern, and a hollow compressor ada ted to fit snugly within said flask, the SELIll'. hollow compressor having a substantially flat interiorup er surface, and having straight inclined we is extending from sai upper surface at an angle toihe sides of the flask, whereby the compressor entering the flask will operate to uniform ly distribute sand over the face of the attern prior to compressing the sand against said pattern.

a twopart flask, a hollow compressor havinginterior peripheral walls inclined at an an Is to the walls of one of the parts of'said fla k, and a second compressor, disconnected from P; the first, havingexternal peripheral pressure surfaces inclined at an angle to the walls of flask, whereby one compressor is adapted. to

and to assist in keeping a pattern om bending during the operat on of the other compressor.

a two-part flas a pattern ositioned thereini over one face of the pattern and to subse quently com ress the sand against the attorn, and w ich-compressor is adapts to remain in the flask until the casting operation is completed,-anda second compressor also, to remain in the flas operation is completed.

6. In an apparatus of'the class described, a flask, a pattern positioned therein, a hollow compressor, the interior contour of which to the compressing operation of sai comover the face of the pattern, and a second conical. I

, 7. In an ap aratus of the class described, a flask, a ho ow pattern having thin walls positioned in said flask, a compressor having a pressure surfaceof a contour correspondin in shape to one side of said pattern, an adapted to distribute the sand over the pattern prior to compressing the sand against said pattern, and a second compressor, seppressure surface corresponding in shape to the other side of said attern, whereby the said compressors are a apted for separate or conjoint use.

8. In an apparatus of theclass described, a flask, a attern therein, means for first automatically distributing sand over said pattern, means for subsequently compressing 3. In an apparatus of the class described,

compressor cooperating with the drag of said remain in the flask for supportin the-sand,

a compressor adapted to istribute the ear) I-.

is substantially frusto-conical, whereb prior pressor the sand is uniformly distributed;

arate from said other compressor, having a' 5. In an ap aratus ofthe class described,

separate from the other com ressor for compressing sand against the ot er faceof said pattern, which second com ressoris adaptcd,-. until the casting.-

its

and corresponding compressor; the exterior contour of which is also substantially frusto-' press sand against the other part of said flask (hiring the ing operations.

- a. u c :i 1

10. In aneppelatns or the class desciioeo, a two-part fiaslr, a pattern positions 'l ithin said. flask, af -male compressor servin to com- .one side of the pat em and adapted to remain Within the hash as to retain the sand 111 place until the casting operation is completed, and a male compressor,

separate from the female compressor, ser mg to compress sand against the other side or said pattern, and'adapted, also, to remain Within the flesh so as to retain the sand in place until the casting opere ion is completed.

in an apparatus of t the combinationol e no u, and a nci mod n i n rginsl Wells and arran' ed to .riter ll e :llzis with said Wells inelin d at an :12 lo to tli 'e? of the whereby thesend in C sl 1 ill; and dis ributod over the pettern' nreh 11111111; to the COHLPJTSSltHl. ol the sand ootr/oer 1e compressor and the pattern, end rein amin n pattern to support the same during the com ismon of th 14. In an eppar; s l e t7 the combination of rai'mner or com 1 Walls in-Ll 11. in an apparatus of the class described, 1

tern preliminary to the compression of the send between the compressor and the pattern, and reinforcing means cooperating With the reverse side of the pattern to support the same during the compression of the sand,

said reinforcing means being separable from the pattern end the flask.

an :paratus of the class described,

combination of s flask, e pattern Within ssi l1, and a hollow rammer or compressor, the e nail contour of which correponcls to the internal shape of the pattern, said com- )ressor 1 7 rovicled with external ribs or c 1 A. rlanges a-tlepte to hold tne sand on the Withdram "l the pat-tern.

.lnan apparatus of the class described,

with reintorcing ribs which are substantially lush that part of the rammer Which'is adapted toflbear against a frame or abutment. 17, in an apparatus of the class described,

the eonibinatioi'i of a flask, a pattern, e rammer or compressor, and means Within the i'las so ning the pattern against i, in the. i olding operation.

i sn-anoar (J-S of the 1S3 clescrhed the pattern, the exterior contour of me being substantially th "some as ier of the pattern. In an app eratus of the class described, fern e-ntl a removable reinforcing ire-me therewith to enable pattern :3 the pressure in ramming. j n an apparatus of the class described, a pattern therein, a compressor I to enter the flask and to cooperate n in molding on one side and a removable frame cooptn theother side oi. the pattern for mg the same to resist the pressure of the sand and the compressor on said pattern.

In an apparatus of the clessclescribed, a ila a pattern therein, s compressor adapted. to en the flash and to cooperate with the pattern in molding sand on one side of the latter, and a reinforcing frame indeot the flask and cooperating with the of" the pattern and removable from v ern. i

y ii an apparatus of the cl ass described,

pattern therein, a compressor nter the flask and. to cooperate ern in molding send on'one side r, and a removable reinforcing eti With the other side of the i, i lternal contour of he pattern.

1 r l 1 L on eppaietiis or the described,

' :P v no proli, e of said frame conl'orin ng v a hollow pattern, one a supporting a compressor, and a removable gate former a compressor, a removable gate former coopcrating therewith, and a pouring'gate adapted to replace said gate former.

,a hollow compressor, and a formers cooperating 25. In an apparatus of the class described, pluralit of gate therewith an removable therefrom, whereby said gate formers may be replaced by pouring gates.

26. In an apparatus of the class described, acom ressor, a pouring gate removably ereto, and means for securing said pourin gate to said compressor.

27. 11 an a paratus of the class described, a compressor aving a removable gate former cooperating therewith, a pouring gate ada ted to replace said gate former, and means lbr allowing air and gases to escape through said compressor during the casting operation.

28. In an apparatus of the class described, a hollow frustd-conical compressor, the inclined walls o which are perforated 'to permit the escape of'gases therethrough during the casting operation.

29. In an apparatus of the class described, a compressor and pouring gate cooperating therewith, and means, separate from the pouring gate and compressor, for allowing the escape of gases during the casting operation.

30. In an apparatus of the class described, a twoart flask, a perforated compressor adapte to enter one part of said flask, and a second perforated compressor adapted to enter the other part of said 'flask, said compressors being adapted to permit the escape of gases therefrom during the casting operation.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

PAUL DUPONT.

Witnesses:

GEORGES BRAUN,. GUSTAVE LEGROUN. 

